GH-9878: Fix ConcurrentModificationException in SpringIntegrationTestExecutionListener

    Fixes: gh-9878

    * return new list in MockIntegrationContext.getAutoStartupCandidates()

Signed-off-by: Alexander Hain <[email protected]>

Author: clf-ahain

spring-integration-test/src/main/java/org/springframework/integration/test/context/MockIntegrationContext.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2017-2024 the original author or authors.
+ * Copyright 2017-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -16,10 +16,7 @@
 
 package org.springframework.integration.test.context;
 
-import java.util.ArrayList;
-import java.util.Arrays;
-import java.util.Collection;
-import java.util.List;
+import java.util.*;
 
 import reactor.core.publisher.Mono;
 
@@ -111,7 +108,7 @@ public void afterSingletonsInstantiated() {
 	}
 
 	List<AbstractEndpoint> getAutoStartupCandidates() {
-		return this.autoStartupCandidates;
+		return Collections.unmodifiableList(this.autoStartupCandidates);
 	}
 
 	/**